How to have only one clone each time an object clones?

Local Script:

local mouse = game.Players.LocalPlayer:GetMouse()
local throwshurikenAnim = game.Players.LocalPlayer.Character.Humanoid:LoadAnimation(script.ThrowShuriken)
script.Parent.Activated:Connect(function()
    if not game.Workspace:FindFirstChild(script.Parent.Parent.Name.."Shuriken") then
        throwshurikenAnim:Play()
        throwshurikenAnim.Stopped:Connect(function()
            game.ReplicatedStorage.Message:FireServer("ThrowShuriken", script.Parent.Handle, mouse.Hit.p)
        end)
    end
end)

ServerScript:

game.ReplicatedStorage.ThrowShuriken.OnServerEvent:Connect(function(player, message, handle, mousepos)
    local debounce = true
    local shuriken = handle:Clone()
    shuriken.Name = player.Name.."Shuriken"
    shuriken.Parent = workspace
    shuriken.CanCollide = false
    shuriken.Position = player.Character.RightHand.Position
    handle.Transparency = 1
    local bodyVelocity = Instance.new("BodyVelocity", shuriken)
    bodyVelocity.Velocity = (mousepos - shuriken.Position).unit*50*Vector3.new(1,0,1)
    local bodyAngularVelocity = Instance.new("BodyAngularVelocity", shuriken)
    bodyAngularVelocity.AngularVelocity = Vector3.new(0, 120, 0)
    debris:AddItem(shuriken,10)
    shuriken.Touched:Connect(function(a)
        print(a.Parent.Name..", "..a.Name)
        if a.Parent.Name ~= player.Name and a.Name ~= "Handle" and a.Name ~= shuriken.Name and debounce == true then
            debounce = false
            if a.Parent:FindFirstChild("Humanoid") then
                a.Parent.Humanoid:TakeDamage(10)
                shuriken:Destroy()
            else
                shuriken.Anchored = true
                print("Anchored")
            end
        end
    end)
    spawn(function()
        repeat wait() until not game.Workspace:FindFirstChild(shuriken.Name)
        handle.Transparency = 0
    end)
end)

When the handle clones the second time, 2 shurikens appear. When it clones the third time, 3 shurikens appear. But I only want 1 to appear each time. How can I fix this?